var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();



app.use((req, res, next) => {

  res.set({
      'Access-Control-Allow-Credentials': true,
      'Access-Control-Max-Age': 1728000,
      'Access-Control-Allow-Origin': req.headers.origin || '*',
      'Access-Control-Allow-Headers': 'X-Requested-With,Content-Type,token',
      'Access-Control-Allow-Methods': 'PUT,POST,GET,DELETE,OPTIONS',
      'Content-Type': 'application/json; charset=utf-8'
  })
  req.method === 'OPTIONS' ? res.status(204).end() : next()
});

// //拦截所有的请求
// app.use((req,res,next)=>{
// 	//比较cookie和session
// 	if(req.cookies['account']){
// 		//相同，则视为已登录状态，跳到下一个中间件
// 		next()
// 	}else{
// 		//不同，则未登录，拦截请求，直接返回错误值。
// 		res.send({msg:"未登录"})
// 	}
// })





// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/index', indexRouter);
app.use('/users', usersRouter);


// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});



// app.listen(3000, function() {
//   console.log('Listening on port %d', 3000);
// });

module.exports = app;
